Copy the code that youâ€™ve received from G2A after purchase.Visit https://caserandom.com/ website and log in with your Steam accountGo to your account page to update your Steam Trade URLPress â€˜Plusâ€™ button, which means fill up the balance, and enter the code that youâ€™ve received from G2A as a promocode.Then your balance will be filled up for the sum equal to the price of the promocode title.